diff --git a/packages/bson-transpilers/test/run-yaml.test.js b/packages/bson-transpilers/test/run-yaml.test.js
index 0ca2dbf4be1..8a66e3c54fa 100644
--- a/packages/bson-transpilers/test/run-yaml.test.js
+++ b/packages/bson-transpilers/test/run-yaml.test.js
@@ -98,8 +98,8 @@ fs.readdirSync(testpath).map((file) => {
                   continue;
                 }
                 if (test.output && output === 'object') { // Can't import libraries from YAML, so un-stringify it first
-                  const expected = executeJavascript(test.output.object);
                   it(`${input}: ${test.input[input]} => runnable object`, () => {
+                    const expected = executeJavascript(test.output.object);
                     const actual = transpiler[input].object.compile(test.input[input]);
                     if (expected && typeof expected === 'object' && '_bsontype' in expected) {
                       expect(actual._bsontype).to.equal(expected._bsontype);
diff --git a/packages/bson-transpilers/test/yaml/bson-methods.yaml b/packages/bson-transpilers/test/yaml/bson-methods.yaml
index bc01a955100..575cfc1ab9d 100644
--- a/packages/bson-transpilers/test/yaml/bson-methods.yaml
+++ b/packages/bson-transpilers/test/yaml/bson-methods.yaml
@@ -382,7 +382,7 @@ tests:
             object: new Long(419430400, 0)
     Decimal128-methods:
     -   input:
-            javascript: new Decimal128(Buffer.from('5')).toString()
+            javascript: new Decimal128(Buffer.from('5\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0')).toString()
         output:
             python: str(Decimal128('5.3E-6175'))
             java: Decimal128.parse("5.3E-6175").toString()
diff --git a/packages/bson-transpilers/test/yaml/bson.yaml b/packages/bson-transpilers/test/yaml/bson.yaml
index f3b79d1ea64..93691b9b3f6 100644
--- a/packages/bson-transpilers/test/yaml/bson.yaml
+++ b/packages/bson-transpilers/test/yaml/bson.yaml
@@ -363,7 +363,7 @@ tests:
     Decimal128:
     - description: 'buffer arg'
       input:
-          javascript: Decimal128(Buffer.from('5'))
+          javascript: Decimal128(Buffer.from('5\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'))
       output:
           shell: new NumberDecimal(5.3E-6175)
           python: Decimal128('5.3E-6175')
@@ -383,14 +383,14 @@ tests:
           object: Decimal128.fromString('5')
     - description: 'NEW'
       input:
-          javascript: new Decimal128(Buffer.from('5'))
+          javascript: new Decimal128(Buffer.from('5\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'))
           shell: new NumberDecimal('5.3E-6175')
       output:
           shell: new NumberDecimal(5.3E-6175)
           python: Decimal128('5.3E-6175')
           java: Decimal128.parse("5.3E-6175")
           csharp: Decimal128.Parse("5.3E-6175")
-          object: new Decimal128(Buffer.from('5'))
+          object: new Decimal128(Buffer.from('5\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'))
     - description: 'number arg'
       input:
           shell: NumberDecimal(5)
diff --git a/packages/bson-transpilers/test/yaml/error-misc.yaml b/packages/bson-transpilers/test/yaml/error-misc.yaml
index d2515a3fce7..6e1c4fcb9be 100644
--- a/packages/bson-transpilers/test/yaml/error-misc.yaml
+++ b/packages/bson-transpilers/test/yaml/error-misc.yaml
@@ -218,7 +218,7 @@ tests:
       errorCode: E_BSONTRANSPILERS_ATTRIBUTE
     - description: Decimal128 with invalidMethod
       input:
-          javascript: new Decimal128(Buffer.from('5')).invalidMethod()
+          javascript: new Decimal128(Buffer.from('5\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0')).invalidMethod()
           python: Decimal128('1').invalidMethod()
       errorCode: E_BSONTRANSPILERS_ATTRIBUTE
     - description: Timestamp with invalidMethod
diff --git a/packages/bson-transpilers/test/yaml/imports.yaml b/packages/bson-transpilers/test/yaml/imports.yaml
index 1474e2d41ac..2c2d1e6521b 100644
--- a/packages/bson-transpilers/test/yaml/imports.yaml
+++ b/packages/bson-transpilers/test/yaml/imports.yaml
@@ -296,7 +296,7 @@ tests:
     - description: Single import NumberDecimal
       input:
           shell: "{x: NumberDecimal(1)}"
-          javascript: "{x: Decimal128(1)}"
+          javascript: "{x: Decimal128.fromString('1')}"
           python: "{'x': Decimal128('1')}"
       output:
           java: |-
@@ -368,7 +368,7 @@ tests:
         12: undefined, 100: Code('1', {x: 1}), '100a': Code('!'), 101: ObjectId(),
         103: DBRef('c', ObjectId()), 104: Double(1), 105: Int32(1), 106: Long(1, 100),
         107: MinKey(), 108: MaxKey(), 110: Timestamp(1, 100), 111: BSONSymbol('1'), 112:
-        Decimal128([1]), '201a': new Date()}"
+        Decimal128('1'), '201a': new Date()}"
       output:
           java: |-
               import java.util.regex.Pattern;
diff --git a/packages/bson-transpilers/test/yaml/partial.yaml b/packages/bson-transpilers/test/yaml/partial.yaml
index dc5a8c949ec..2f26414969f 100644
--- a/packages/bson-transpilers/test/yaml/partial.yaml
+++ b/packages/bson-transpilers/test/yaml/partial.yaml
@@ -401,7 +401,7 @@ tests:
           csharp: 429496729601L >>
           shell: new NumberLong(429496729601) >>
     - input:
-          javascript: new Decimal128(Buffer.from('5')).toString
+          javascript: new Decimal128(Buffer.from('5\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0')).toString
       output:
           javascript: ''
           python: str